不同植物来源纳米原纤纤维素 (NFC) 中作为结构组成部分的水合水的介电响应。
Dielectric response of hydrated water as a structural component of nanofibrillated cellulose (NFC) from different plant sources.
机构信息
Kazan Institute of Biochemistry and Biophysics, FRC Kazan Scientific Center of RAS, Lobachevsky Str. 2/31, 420111, Kazan, Russian Federation; Kazan Federal University, Kremlyovskaya str., 18, 420008, Kazan, Russian Federation.
The Hebrew University of Jerusalem, Department of Applied Physics, Edmond J. Safra Campus, Jerusalem 9190401, Israel; The Hebrew University of Jerusalem, Racah Institute of Physics, Edmond J. Safra Campus, Jerusalem 9190401, Israel.
出版信息
Carbohydr Polym. 2019 Dec 1;225:115217. doi: 10.1016/j.carbpol.2019.115217. Epub 2019 Aug 19.
The current work illuminates the interplay between nanofibrillated cellulose (NFC) films and hydrated water. The NFC films from three sources of technological importance, i.e. cotton, wood and flax, are compared. It is shown that cellulose materials present slight variations in supramolecular structure depending on the plant origin. The structural differences determine both quantity and state of the water adsorbed by cellulose. Dielectric spectroscopy was employed to study the state of hydrated water as a probe of both the overall and specific marks of NFCs' structure. The measurements, carried out in the wide frequency (10Hz -10Hz) and temperature (123 K-293 K) ranges, revealed the formation of non-interactive water clusters at low water content. At high water content, additional states of water were identified: Water in saturated glass-forming solution and bulk. These water states were shown to be determined by the NFC's structure and morphology.
当前的工作阐明了纳米原纤纤维素 (NFC) 薄膜与水合水之间的相互作用。对比了三种具有技术重要性来源的 NFC 薄膜，即棉花、木材和亚麻。结果表明，纤维素材料根据植物来源在超分子结构上略有差异。结构差异决定了纤维素吸附水的数量和状态。介电光谱法被用于研究水合水的状态，作为 NFC 结构的整体和特定标志的探针。在宽频率（10Hz-10Hz）和温度（123K-293K）范围内进行的测量揭示了在低含水量下形成非相互作用的水团簇。在高含水量下，确定了额外的水状态：处于饱和玻璃形成溶液和本体中的水。这些水状态被证明取决于 NFC 的结构和形态。
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